If you have an ACT2.2 - cj350 combo IMHO it is not easy to find a better amplifier for this preamplifier unless you want to go with cj tube amplifiers.
The choice of an amplifier always depends on the speakers, but unless you want to spend a lot of money or if there is an incompatibility between your current cj 350 and your speakers better spend the money in better cables or source :-) !
The choice of an amplifier always depends on the speakers, but unless you want to spend a lot of money or if there is an incompatibility between your current cj 350 and your speakers better spend the money in better cables or source :-) !